US1213813A

US1213813A - Elevated drafting-rule.

Info

Publication number: US1213813A
Application number: US8328216A
Authority: US
Inventors: Andrew E Anderson
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-03-10
Filing date: 1916-03-10
Publication date: 1917-01-30
Anticipated expiration: 1934-01-30

Description

A. E. ANDERSON.

ELEVATED DRAFTING RULE.

APPLICATION nusn MAR- 10. I916- Patented Jail. 30, 1917.

VENTOR.

BY 51 JK ATTORNEYS.

IN] FM IN ELEVATED DRAFTING-RULE.

Specification of Letters Patent.

Patented Jan. 3d, Twit.

Application filed March 10, 1916. Serial No. 83,282.

To whom it may concern Be it known that T, ANnnnw l1l.-;\1 vo r:n- SON, a citizen of the United States, residing at Brownsville, in the county of Cameron and State of Texas, have invented certain new and useful Improvements in Elevated Drafting-Rules, of which the following is a specification.

This invention relates to new and, useful improvements in an instrument for the rule from the drawing, said ruling edge or straight edge may be raised and shifted to a new position without the danger of its smearing the undried ink underneath; to provide a drafting rule, which, when being shifted or slid over the surface of the drawing, will be in contact with said surface at only four places, each of almost negligible area, thus preventing the drawing paper or cloth from being rubbed and soiled as when an ordinary triangle or rule is used; to provide in connection with the straight edge of said rule, means of pressing and holding the drawing paper or cloth firmly against the surface of the drafting table or board, immediately at each end of the line to be ruled and thus procuring a firm surface upon which to draw; and by the same means to provide against the tendency of the rule to slip when in use, caused by the pressure of the pen or pencil or other instrument upon the straight edge of the rule.

l l ith the above and other objects in view the invention has particular relation to cer' tain novel features of construction, operation and arrangement of parts. an example of which is given in this specification and illustrated in the accompanying drawing, wherein Figure 1 is a perspective View of the rule, Fig. 2 is a top plan view, Fig. 3 is a bottom plan view, Fig. 4 is a transverse sectional view taken on the line aa of Figs. 2 and 3, Fig. 5 is a transverse sectional view taken on the line b-b of Figs. 2 and 3, and Fig. (3 is a. longitudinal sectional view taken on the line 0-0 of Figs. 2 and 3.

Referring now more particularly to the drawings wherein like numerals of reference designate similar parts in each of the figures the numeral 1 refers to the rule proper and is a rectangular body preferably formed of glass or some other suitable rigid transparent material and which has the straight edge 2.

Metallic plates

3 and 4 are crimped over the respective ends of this rule and upstanding from the former of which is the knob 5 by means of which the rule may be lifted and moved. An oblong groove (5 extends from end to end of the rule along its upper side and near the edge opposite the straight edge 2 and parallel with said straight edge 2, and slidable in this groove is the guide 7, upstanding from which is the pin 8 by means of which said guide may be moved back and forth in said groove; and a flexible strap 9 is integral, at one end, with said guide and is bent around underneath the rule and rests closely against the under side thereof, its free end extending as closely as may be to the straight edge 2 of the rule, the bent portion of said flexible strap 9 forming a sprin of suflicient strength to hold said guide% snugly in the groove 6. The ends of the

plates

3 and 4 adjacent to the straight edge and the corresponding end of the strap 9 are deflexed underneath, the bent back portions being bifurcated forming fingers as 10, 10, which diverge as shown in Fig. 3, and rubber tips 11 are secured between said fingers. At the opposite ends of the

plates

3 and 4, and depending therefrom, are the supporting

legs

12 and 13, spaced apart and having smooth rounded ends, the former of which are slightly longer than the latter so that when said legs 13 are touching upon a plane surface the rubber tips will be elevated slightly above the surface. Thus when an ink drawing is being made the rule can be slid on the

legs

12 and 13 and the straight edge 2 brought to another position without smearing the undried ink with the rubber tips. The work can thus proceed without waiting for the ink to dry thereby saving a great deal of time.

When the rule has been moved lllltll the straight edge 2 is in position to rule the line to be drawn a slight pressure on the rubber tips 11 will operate to press the paper or other drawing surface flatly against the surface of drafting table or other sustaining surface, thus insuring a solid surface upon which to draw, and at the same time said tips 11 being of rubber prevent the rule from slipping as it would have a tendency to do, because of the pressure of the pen or pencil or other drawing instrument against the straight edge. 7

The central rubber tip on the flexible strap 9 is arranged to be laterally adjustable for the ruling of lines of varying lengths so that said central rubber tip and one of the other rubber tips will insure contact of drawing surface to sustaining surface underneath immediately at each end of the line to be drawn.

A rule of this character is specially adaptable for use in the drafting of small figures where short divergent lines are being drawn in ink and is more or less useful in various other kinds of drafting work.

What I claim is:

1. A. rule consisting of an oblong body having a straight edge, supporting legs depending therefrom which, when resting upon a plane surface, hold said straight edge above the said surface, one of said legs being movable lengthwise relative to the rule.

2. A rule consisting of an oblong body having a straight edge, supporting legs depending therefrom, whieh, when resting upon a plane surface, hold said straight edge spaced above the surface, spacers depending from the rule underneath said straight edge, and an upstanding knob carried by the rule.

3. A rule consisting of an oblong body 7 having a straight edge, supporting legs depending therefrom, which, when resting upon a plane surface, hold said straight edge spaced above the surface, and spacers depending from the rule underneath said siglaight edge, one of said spacers being mova e.

' 4. A rule consisting of an oblong member having a straight edge, supporting legs depending therefrom and spaced apart, and also spaced from said-"straight edge and a spacer depending from the rule underneath the straight edge.

5. A rule consisting of an oblong member having a straight edge, supporting legs depending therefrom and spaced apart, and also spaced from said straight edge and a plurality of spacers depending from the rule underneath said straight edge, one of which is movable.

6. A rule consisting of an oblong member having a straight edge and a lengthwise groove, metallic plates secured to the respective ends of 'the rule, a guide slidable in said grooves, a strap integral with the guide and whose free end extends underneath the straight edge, spacers arranged underneath the straight edge and depending from said plates and strap respectively, the latter of which is movable and a pair of depending legs arranged at each end of the rule and integral with. the corresponding plates and spaced from said straight edge.

In testimony whereof I havesigned my name to this specification in the presence of two subscribing witnesses.

ANDREW E. ANDERSON.

Witnesses:

DAVID H. Snoss, ARTHUR BLANCO.